Coupling dynamos



(No Model.) 2 Sheets-Sheet 1.

O. P. LOOMIS.

COUPLING DYNAMOS.

No. 396,580. Patented Jan. 22, 1889.

(No Model.) 2 Sheets-Sheet 2. 0. P. LOOMIS.

COUPLING DYNAMOS. No. 396,580. Patented Jan. 22, 1889.

UNITED STATES PATENT CrEicE.

OSBORN P. LOOMIS, OF SOMERVILLE, MASSACHYSETTS, ASSIGNOR TO THE LOOMIS ELECTRIC MANUFACTURING COMPANY, OF NEXV YORK.

COUPLING DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 398,580, dated January 22, 1889.

Application filed geptemher 18, 1887. Serial No. 249,578. (No model.)

To all 1071 0712, it may concern.- This feature of winding the series coil upon Be it known that I, OsBoRN P. LOOMIS, a the pole-pieces forms no part of my invention citizen of the UnitedStates,residingat Someras described and illustrated in the present ville, in the county of Middlesex and State of case, the same being shown and claimed by Massachusetts, haveinvented certain new and me in another application, Serial X0. 2%,? 6, 5 5

useful Improvements in Coupling Dynamos, filed September 9, 1887.

of which the following is such a full, clear, a Z) represent the positive and negative and exact description as will enable any one terminals, respectively, of the dynamo A, and

skilled in the art to which it appertains to a? b the corresponding terminals of the dy IO make and use the same, reference being had namo A the current being conveyed to the 60 to the accompanying drawings, forming part same by brushes bearing upon the commutaof this specification. tor, as ordinarily. The series coils are shown My invention relates more particularly to as connected to the binding-post b and Z2 and the coupling of compound-wound dynamos the circuits thereof pass from said coils when arranged in multiple arc to supply an through circuits cc'fltheindex of theletters in 6 5 electrical circuit. each instance indicating the dynamo referred hen dynamos are coupled in circuit as to. The circuits 0 c are connected with reindicated, they are apt to vary in electro-moturn-circuit B. In these circuits are placed tive force, so that the stronger will overcome electro-niagnets d and (Z and betweentheelecthe weaker. Even when such machines are t-ro-magnets is a pivoted lever, e, which is held 70 made exactly alike they will develop this difin its normal position by one or more springs ference of electro-motive force spoken of. and bears armatures for said electro-mag- The object of my invention to supply a nets. This lever is connected by circuits f means whereby each dynamo will have the and f to the circuits 0 and respectively,

same effect as the other or others, and thus at the'points 1 The lever e bears at each 75 keep the electro-motive force of the several end, preferably, carbon contacts insulated dynamos the same. I am aware that such from the same, which are adapted tobe placed dynamos have heretofore been provided with in circuit with conductors 7t and 7L2, respectan equalizing-connection to overcome the ively,leading to thenegative terminalof each above trouble, which is well known to elecdynamo, the terminals of said conductors 130- So tricians. ing arranged in co-operative proximity to the My invention consists of electro-magnets contacts borne by the said lever. arranged in the circuits emanating from the Let us suppose now that the dynamo A dynamos to the main circuit, which magnets generates an electro-motive force in excess of 3 5 control contact devices to so modify the magthe electro-motive force furnished by the dy- 8 5 netizing effect of the coils of the dynamos as namo A from any cause. Ordinarily this to keep each one at its constant of work. would cause the current of dynamo A to Figure l is a diagrammatic view of an apshort-circuit itself by way of the circuits 0 paratus, showing the principle of the invenand 0 upon the dynamo A and thus over- 40 tion; Fig. 2, a diagrammatic view of a modipower the latter. By the construction I have 90 fication thereof, and Fig. 3 a still further described this would not occur, for the magmodiiication. net cl would in the case supposed be more In the several figures of the drawings the strongly energized by reason of the excess of same letters indicate the same or correspond electro-motive force from the dynamo A than ing parts throughout. the electro-magnet (Z and would thus draw 9 5 A and A designate two dynamos coupled the pivoted lever c in contact with the conin multiple arc, supplying a main circuit,BB. ductor 71 A short circuit would then be C C are the derived or shunt circuit coils, formed around the series coils D D by way of and D D the main or series coils,which latter conductor h, contact g, and circuit 1'. fl he I have shown as wound upon the polepieces. series coils having thus been cut out of cir- Ioo cuit, the dynamo A would have less magnetizing effect, and the action of the two dynamos be thereby equalized. The spring brings the lever 6 back to its original position and restores the apparatus to its normal condition. Should the dynamo A overpower the dynamo A, the reverse operation would take place and the main coils D D of said dynamo be shortcircuited by way of the conductor h contact g and circuit f and the dynamo A be restored to its normal capacity.

In Fig. 2 I have shown an arrangement embodying a modification of the above to illustrate how the principle can be applied in a slightly-modified way. Here I provide sprin 'i 2' against which the contacts 9 and 9 respectively, bear normally, and conductors 7r and leading from said springs to a point intermediate of the ends of the series coils, so that a portion of the series coils is normally shunted by the circuits It" and contacts, and conductors f and f I do not limit myself to the arrangement shown, but illustrate the same merely to set forth the principle of operation. Should now the dynamo A overpower the dynamo A, the contacts g and 6 will be separated, and the contact be placed in electrical communication with the conductor 7L2. This will put in circuit all the series coils of the dynamo A, increase its magnetizing effect and thereby its current, and will short-circuit the series coils of the dynamo A as before explained, decrease its magnetizing effect and lessen. its current, so as to bring the same up to the normal capacity. Should the dynamo A overbalance the dymano A the reverse operation will take place, and a like result be accomplished. The contact-springs 2" and may serve to bring the armaturelever 6 back to its normal position after the equalizing effect has been accomplished.

In Fig. 3 I have illustrated a still further modification, in which I dispense with shortcircuiting and putting in more turns of the series coils, and produce the required effect by modifying, preferably, the resistance of the shunt-coils. The electro-magnets CZ and (l are arranged in the circuits 0' and c and the lever e disposed as in the previous instances. From the shunt-coils I run wires Z l to graduated resistances R and R and from the negative poles are run the conductors m m connecting, respectively, with the insulated circuit-closers upon the respective ends of the lever e. \Vhen one dynamo in this arrangement overpowers the other, the circuitcompleters are caused to rub along the graduated resistances, so as to throw in more resistance in the shunt-coils of the most powerful dynamo and to interposc less resistance in the shunt-coils of the less powerful dynamo, thus decreasing the magnetizing elfect of one dynamo and increasing the magnetizing effect of the other, so as to equalize the action of said dynamos.

Of course the poles of the appaatus described may be interchanged-that is, positive placed where a negative is shown, and vice versawithout affecting the operation of the apparatus and departing from the invention. So, too, the principle which I have shown embodied in coupling together two dynamos in multiple arc could be extended. so as to be applied to more than two dynamos without departing from the invention. It will be evident, also, that the various devices I have described maybe changed and modified in many respects by those skilled in the art and still be within my invention. I wish to have it understood, therefore, that I do not limit myself to the exact mechanism described; but

\Vhat I desire to claim and secure by Letters Patent of the United States is l. The combination, with dynaino-machines supplying current to an electric current in multiple arc, of electro-magnets arranged in the circuits emanating from said dynamo-machines, and contacts controlled thereby to modify the magnetizing effect of the fieldmagnet coils thereof, so as to produce an equalizing effect between the same.

2. The combination, with dynamo-machines arranged in multiple arc in an electric circuit, of electro-magnets arranged in the circuits emanating from said dynamos, contacts controlled by said electro-magnets as one or the other dynamo ovcrbalances the other, and electrical connections from the field-magnet coils having their terminals arranged in the path of said contacts, for the purpose described.

3. The combination of the dynamos A and A of any suitable type arranged in multiple arc in an electric circuit, the electro-magnets d d in the circuits leading from said dynamos, a pivoted lever, e, disposed between the same, and electrical connections from said dynamos controlled by said electro-magnets and lever to equalize the current supplied by said dynamos upon a rise of potential in either. 4. The combination, with the compoundwound dynamos A and A of any suitable type arranged in multiple arc in an electric circuit, of the electro-magnets d and d in the circuits emanating from said dynamos, a normally-open short circuit around the series coils of said dynamo, and contact devices controlled by the preponderance of current circulating in said electro-magnets to close the short circuit of the series coils of the preponderating dynamo to equalize the current supplied by the two.

5. The combination, with the compoundwound dynamos A and A of any suitable type supplying an electric circuit in multiple arc, of a normally-open short circuit around the series coils of each, electro-magnets arranged in the circuits emanating from said dynamos and in the circuit of said short circuit when estabfished, and a pivoted lever maintained in normy hand and seal, This 9th day of September Ina-1 position bearing armaiures for said elee- 1887, 111 the presence of The two snhscrlblng' fro-magnets, and controlled thereby to estab- Witnesses.

lish one or the other short circuit as one 01- the OSBORX P. LOOMTS. [11. 5 other dynamoprepondemtesin electro-moiive \Vitnessesi force. CHAS. A. PIERCE,

In testimony whereof I have hereunto set GEORGE \YYATT DICKERAIAN. 

